Kiwifruit root knot nematode control

Kiwifruit root-knot nematode disease occurs in the kiwifruit planting areas in China, and is severe in some areas. This disease is one of the important factors affecting the yield increase of kiwifruit. How to control root knot nematode disease of kiwifruit, Li Longshan, a researcher at the College of Horticulture, Northwest Agriculture and Forestry University, provides guidance for farmers.

Symptoms

Kiwi root knot nematodes mainly damage the roots. Kiwifruit can be affected from the seedling stage to the adult stage. Damaged at the seedling stage, the plants are short, and the shoots are short and thin. The leaves are thin and thin, and the roots have a large amount of compaction. In the adult plant stage, the trees are weak, the branches are weak, the yellow leaves are easy to fall off, and the results are small and stiff; the root volume increases, the color darkens, and 5 to 6 or even more than 20 roots can be born on an 8 cm long root. In the case of nematodes, the roots and roots of the worms became black and rot and the whole plant died of wilting. The disease is spread by seedlings, soil with diseased soil, water sources, farm implements, and livestock and humans.

Control methods

In strict quarantine inspection of seedlings, strict quarantine should be conducted to prevent the spread and spread of pests and diseases.

Seedling breeding selection of anti-nematode rootstock, such as soft-jujube kiwifruit as the rootstock more resistant; cultivate disease-free seedlings.

It is better to not pick up the kiwifruit seedlings from the soil where the cotton plants, grapes and other fruit trees have been planted in the site; the soil should be disinfected before the cultivating in the wards. The method is to use 4 to 5kg of granules per acre to eliminate root knots. Eggs, larvae, and adults of nematodes.

Strengthen management and increase organic manure, apply soil testing formula fertilizer, improve soil and improve soil permeability; attach importance to management of branches and pruning in orchard, rational dense planting, improve air and light conditions in the park, enhance tree vigor, and increase disease resistance ability.

The diseased seedlings were treated by cutting root nodules before planting. Roots were immersed in warm water at 48°C for 15 minutes to kill the nematodes in the root nodules.

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